Circuit Breakers

Part Number	Description / PDF	Quantity
GFR2C10100 Altech Corporation	EGFP+OL 10A277V AC 100MA C TRIP	1
GFL2D20100S Altech Corporation	MCCB+EGFP 20A120240V AC 100MA D	0
GFL2B16100SN Altech Corporation	MCCB+EGFP 16A120240V AC 100MA B	0
1Z3UM Altech Corporation	1Z3UM 3A CIRCUIT BREAKER Z CHAR	120
3ZU30L Altech Corporation	3ZU30L30AMCBZCHAR3P 480Y/277VACU	0
3D32UL Altech Corporation	3D32UL 32A CIRCUIT BREAKER D CHA	0
3D50UR Altech Corporation	3D50UR 50A MCB D CHAR 3 P 480Y/2	40
1C30UM Altech Corporation	1C30UM 30A CIRCUIT BREAKER C CHA	0
1DU05L Altech Corporation	1DU05L 0.5A MCB D CHAR 1P277VACU	0
GFL2B40100SN Altech Corporation	MCCB+EGFP 40A120240V AC 100MA B	0
1DU13R Altech Corporation	1DU13R13A MCB D CHAR 1P277VACUL1	0
1G05UM Altech Corporation	1G05UM0.5A CIRCUIT BREAKER G CHA	0
3Z2.5UM Altech Corporation	3Z2.5UM 2.5A CIRCUIT BREAKER Z C	0
GFR2C08100 Altech Corporation	EGFP+OL 8A277V AC 100MA C TRIP 1	0
2D2UR Altech Corporation	2D2UR 2A MCB D CHAR 2 P 480Y/277	0
1D1DL Altech Corporation	1D1DL 1A CIRCUIT BREAKER D CHAR	0
GFR4B06100 Altech Corporation	EGFP+OL 6A480Y277V AC 100MA B TR	0
TR11-C-X-63-B-0-C-0.9A Altech Corporation	CIRCUIT BREAK TRIP BAND HEX MET	0
DC1DU1.6L Altech Corporation	16A MCB D CHAR 1P125VDCUL489	0
2Z15UL Altech Corporation	2Z15UL 15A CIRCUIT BREAKER Z CHA	5

Circuit Breakers

1. Overview

Circuit breakers are automatic electrical switches designed to protect circuits from damage caused by overloads or short circuits. Unlike fuses, they can be reset after tripping. Modern circuit breakers ensure electrical safety, prevent equipment damage, and maintain system reliability in residential, commercial, and industrial applications.

2. Main Types and Functional Classification

Type	Function Features	Application Examples
MCB (Miniature Circuit Breaker)	Thermal-magnetic protection, <100A rating	Residential wiring, lighting circuits
MCCB (Molded Case Circuit Breaker)	Adjustable trip settings, 10-2500A rating	Industrial machinery, HVAC systems
ACB (Air Circuit Breaker)	High fault current interruption, 400-6300A rating	Power distribution in data centers
RCCB (Residual Current Circuit Breaker)	Earth leakage protection (5-500mA sensitivity)	Outdoor outlets, swimming pool equipment
RCBO (Residual Current Breaker with Overcurrent)	Combines overload, short-circuit, and leakage protection	Hospital equipment, construction sites

3. Structure and Components

Typical components include: - Enclosure: Flame-retardant insulating material housing - Contacts: Silver alloy for high conductivity - Trip Mechanism: Bimetallic strip (thermal) and electromagnetic coil (magnetic) - Arc Extinguisher: Multi-plate chamber for arc suppression - Operating Lever: Manual ON/OFF control with position indicators

4. Key Technical Parameters

Parameter	Description	Importance
Rated Current (In)	Maximum continuous current without tripping	Determines load capacity
Rated Voltage (Un)	Maximum operating voltage	Ensures insulation safety
Breaking Capacity (Icu)	Maximum fault current interrupting capability	Prevents catastrophic failure
Tripping Characteristics	Time-current curve (B/C/D types)	Matches load requirements
Pole Number	1P to 4P configurations	Determines phase protection

5. Application Fields

Power distribution: Residential panels, commercial switchboards
Industrial equipment: Motors, transformers, CNC machines
Renewable energy: Solar inverters, wind turbine systems
Transportation: EV charging stations, rail traction systems

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
Schneider Electric	Acti 9 series	Modular design, 0.5-125A range
Siemens	5SJ series	High short-circuit withstand, DIN rail mount
ABB	Emax series	Smart connectivity, up to 6300A
General Electric	THQL series	UL-certified, industrial motor protection

7. Selection Guidelines

Key considerations: - Match rated current to load requirements (125% safety margin) - Select tripping curve (Type B for resistive loads, C for motors) - Verify breaking capacity against system fault levels - Consider environmental factors (temperature, altitude) - Ensure compliance with standards (IEC 60898, UL 489) - Example: For a 20kW motor (400V), select MCCB with 63A rating, Type C curve, 50kA breaking capacity

8. Industry Trends

Emerging trends include: - Smart grid integration with IoT-enabled monitoring - Compact designs for space-constrained applications - Eco-friendly materials with halogen-free construction - Integration with renewable energy systems - Predictive maintenance via AI-powered diagnostics - Increased adoption of DC circuit breakers for EV infrastructure